Improvement in underground-telegraphs



UNITED STATES PATENT OFFICE DAVID BROOKS, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN UNDERGROUND-TELEGRAPHS.

Specication forming part of Letters Patent No. 184,329, dated November 14, 1876; application led April 24, 1876.

To all whom it may concern Be it known that I, DAVID BROOKS, of Philadelphia, Pennsylvania, have invented an Improvement in Preparing Telegraph- Wires for Underground Use, of which the following is a specification:

The object of my invention is to prepare for transportation and sale lengths ot' insulated telegraph-wires for readylaying under ground; and this object I attain as hereafter described, re'erence being had to the accompanying drawing', the figure in which represents, in section, part ot' a tube containing a group of telegraph-wires with their protecting cover ready for adjust-ment.

A is a tube, which should be of an internal diameter proportionate to the number of insulated wires which it has to contain, suitable tubing for the purpose being such as is used for gas distribution.

The wires a are clothed with fibrous material, which is impregnated with an insulating substance,'by preference with parafne. The tube, which may be of the same lengt-h as those used for gas, is heated to the degree at which parafne melts, and is then placed in a vertical or inclined position, and, while still hot, melted parafne is poured into the elevated end, so that it will flow into the tube, lill all the interstices, and add to the secure insulation ofthe clothed wires. These wires must project from each end of the tube, as shown in Fig. l; and, in order to protect these exposed wires during transportation, I screw onto each end of the tube a shorter tube, closed at the outer end, and long enough to.

DAVID BROOKS. Witnesses:

ELLWooD T. DEETz, HARRY SMITH. 

